because theyre cheap, even in new form, minus s2000 (which arent drag cars anyways).
majority of parents buy their kids a civic because theyre built well, last forever, even if u never do any maintenance, and theyre somewhat safe (and by safe i also mean slow, u wont kill anyone --- or so everyone thought back in 1990).
therefore, majority of honda owners are 16-21 year olds. and we all know that is the stupidest age group around. its a phase for most, as you'll notice theres a constant influx and outflux of new riced out civic owners. most will get a good job and move up and past their youthful stupid days (sadly, they all get 240sx now and go "drifting" wheeee

)
there are still decent honda owners out there. they are the ones putting quality parts on the car, going to track days, road race days, being respectful at meets, and never ever seen in the vicinity of such places as gandy or CC.
and theres also alot of 16-21 year olds who own 240's, neons, mustangs, camaros, and others. there are also guys who are 30 or 40 who are still douchebags.
i learned to deal with it. i have to deal with alot of douchebags who own nissans. granted, i have to say alot of these 'idiots' are usually half decent when you talk to them. if u were to meet them before seeing the car they drove or anywhere else but a 'car event', most of them would be okay to hang out with. but once people enter their car, they seem to shutoff half of their brain cells.